SLUSF11C February   2023  – March 2024 UCC14341-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Insulation Specifications
    6. 6.6  Electrical Characteristics
    7. 6.7  Safety Limiting Values
    8. 6.8  Safety-Related Certifications
    9. 6.9  Insulation Characteristics
    10. 6.10 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Power Stage Operation
        1. 7.3.1.1 VDD-VEE Voltage Regulation
        2. 7.3.1.2 COM-VEE Voltage Regulation
        3. 7.3.1.3 Power Handling Capability
      2. 7.3.2 Output Voltage Soft Start
      3. 7.3.3 ENA and PG
      4. 7.3.4 Protection Functions
        1. 7.3.4.1 Input Undervoltage Lockout
        2. 7.3.4.2 Input Overvoltage Lockout
        3. 7.3.4.3 Output Undervoltage Protection
        4. 7.3.4.4 Output Overvoltage Protection
        5. 7.3.4.5 Overpower Protection
        6. 7.3.4.6 Over-Temperature Protection
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Capacitor Selection
        2. 8.2.2.2 Single RLIM Resistor Selection
        3. 8.2.2.3 RDR Circuit Component Selection
        4. 8.2.2.4 Feedback Resistors Selection
    3. 8.3 System Examples
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
      2. 8.5.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
  13. 12Tape and Reel Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.4 Device Functional Modes

Depending on the input and output conditions, ENA pin voltage, as well as the device temperature, the UCC14341-Q1 operates in one of the below operation modes.

  1. Disable mode. In this mode, the module is off, but waiting for ENA pin becoming high to start operate.
  2. Soft-start mode. In this mode, the module starts to deliver power to the secondary side. The primary-side operation duty cycle and secondary-side references are raised gradually to reduce the stress to the module.
  3. Normal operation mode. In this mode, the module operates normally, delivers power to the secondary side.
  4. Protection mode, auto-recovery. In this mode, the module is off, due to the input UVLO or OVLO protection. After the input voltage fault is cleared, depending on the ENA pin voltage condition, it either becomes disabled mode if the ENA pin voltage is low, or it goes through soft-start mode to the normal operation mode.
  5. Protection mode, latched-off. In this mode, the module is off, due to other protections. The module remains off even the fault causing the protection is cleared. Recycling VVIN operation must ensure the input voltage goes below the analog UVLO falling threshold (VVIN_ ANALOG_UVLOP_FALLING ) first to reset the latch-off state, or the ENA pin is toggled Low (OFF) then High (ON).

Table 7-1 lists the supply functional modes for this device. The ENA pin has an internal weak pull-down resistance to ground, but TI does not recommend leaving this pin open.

Table 7-1 Device Functional Modes

INPUT

OUTPUTS

 Operation Mode
VVIN ENA FAULT V(VDD – VEE)
Isolated Output1		 V(COM – VEE)
Isolated Output2		 PG Open Drain
VVIN < VVIN_UVLOP_RISING X X OFF OFF High Protection mode, auto-recovery
VVIN_UVLOP_RISING < VVIN < VVIN_OVLO_RISING LOW X OFF OFF High Disable mode
VVIN_UVLOP_RISING < VVIN < VVIN_OVLO_RISING HIGH NO FAULT Regulating at Setpoint Regulating at Setpoint Low Normal operation
VVIN_UVLOP_RISING < VVIN < VVIN_OVLO_RISING HIGH YES FAULT OFF OFF High Protection mode, latched-off
VVIN > VVIN_OVLO_RISING X X OFF OFF High Protection mode, auto-recovery